A detailed listing of the new book's Corsair Eldar Army List has been revealed by poster 'Killgore' on Warseer:

Just got back from London to find my signed IA 11 that I ordered using standard delivery waiting on my doorstep
 

The Farseer special character 'Bel-Annath' has a pretty nifty witchblade that can unleash a ap2 template attack once per game and alters the force organisation chart to allow more Heavy support at the expence of elites

The Corsair army is interesting with the option for most of the army to have Jet packs

HQ

Corsair Prince- lots of options, including nightfight, deep strike and orbital bombardment shinanigans
Corsair Blade Sworn Retinue- the Prince's best mates, nice CC unit
Corsair Void Dreamer- Psyker, can use either a destructive, defencive or LD enhancing power each turn

Elites

Voidstorm squad- Veteran CC unit, good source of melta bombs but fragile
Harlequin troupe- nothing new here
Eldar craftworld outcasts- single fast attack or elite unit taking from the Eldar codex
Dark Eldar Kabalite Warriors

Troops

Corsair squad- can be given Falcon or Venom as a transport
Wasp assault squadron- cannot excede number of corsair squads in the army
Jetbike squadron- scouts and can give leader a powersword/ fusion pistol

Fast Attack

Hornet Squadron
Nightwing interceptor
Night Spinner

Heavy support

Phoenix Bomber
Warp Hunter
Fire Storm



Exciting stuff! Though the prospect of fielding an entire army made up almost entirely of Forgeworld models is an expensive one.

Still, I'm sure it could be pulled off using current (and future) Eldar and Dark Eldar models. Hmmm...

Can't wait to get this book!